It’s officially official, for real this time. The most unsurprising announcement from Marvel Studios to date confirms that both Aaron Taylor-Johnson and Elizabeth Olsen will be suiting up and joining Earth’s Mightiest in Joss Whedon’s The Avengers: Age of Ultron. Since before Comic-Con, Johnson hasn’t been shy about admitting that he’s been in talks with Marvel and Whedon about his potential role and more recently, Olsen’s been vague and dodgy about reports of her involvement as well.

The pair, who will first come together on screen next summer for Godzilla, will join the likes of Black Widow, Captain America, Hawkeye, Hulk, Iron Man and Thor the following summer in a battle against Ultron in The Avengers 2.

Olsen will play Scarlet Witch and Johnson will play Quicksilver, siblings whose origins will be altered for their onscreen debuts due to Twentieth Century Fox also owning film rights to the characters since they are also X-Men characters. In the Marvel Cinematic Universe, the super fast Quicksilver and magic-based Scarlet Witch won’t be mutants so we’re curious as to how their powers will be explained in the film and how they fit into the Ultron storyline.

When first teasing the introduction of the “brother-sister act,” writer and director Joss Whedon revealed that the two are among his favorite characters so there are very specific story reasons why they are being introduced now. We also know that the characters don’t necessarily agree with The Avengers so we’re curious what makes them join the team and if we’ll see a villainous side to them as well since they’re not always “heroes” in Marvel Comics.

The announcement comes just three months before The Avengers: Age of Ultron begins shooting in February, and during post-production of both Captain America: The Winter Soldier and Guardians of the Galaxy which have both wrapped principal photography. Don’t be surprised then if we see one or both of the super-powered siblings make a cameo in one or the other (likely Cap 2) just like Clint Barton aka Hawkeye (Jeremy Renner) made a guest appearance in Thor before suiting up alongside The Avengers last summer.

The increased number of characters in The Avengers sequel raises some interesting questions. Will one (or some) of them die (not like Coulson, but for real)? Whedon hinted at the possibility. Is there room for supporting characters like Falcon (Anthony Mackie), Sharon Carter (Emily VanCamp) and War Machine (Don Cheadle) who are both interested in joining?

The introduction of Scarlet Witch and the idea of “magic” opens up a new segment of the Marvel universe for the films, potentially opening the door for a Doctor Strange movie in 2016 or 2017, and even connections to the Marvel cosmos. Will introducing a character potentially so powerful pose storytelling problems? Are Olsen and Johnson contracted for multiple films? Share your thoughts in the comments!

Captain America: The Winter Soldier on April 4, 2014, Guardians of the Galaxy on August 1, 2014, The Avengers: Age of Ultron on May 1, 2015, Ant-Man on July 31, 2015, and unannounced films for May 6 2016, July 8 2016 and May 5 2017.